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. 2017 Apr 6;33(4):457–471. doi: 10.1007/s10453-017-9478-2

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© The Author(s) 2017

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 3 — Bars showing the time fractions for each LWT of air pollutants exceeding daily maximum thresholds (NO_{2 max} > 60 µg m⁻³, PM_{10 max} > 50 µg m⁻³ and O_{3 8h max} > 80 µg m⁻³) in Gothenburg (a) and Malmö (b) during the birch pollen season